The traveler and witness are not the gardener/winnower. We haven't met the latter. The only thing we've seen of either of those 2 is the statue inside the pyramid, that eris touched.
The former, traveler/witness, are just para whatever entities. At first it was thought the traveler was the gardener, but the lore/ story has shown it's not, it's just a player in the light/dark game between the gardener/winnower. It's on the light side.
The witness was on the darkness side, but now doesn't like the game and wants to end it all, hence why the final shape he and his disciples speak of is basically a great nothing.
The pyramids are the darkness equivalent of the traveler.
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I agree? That was my initial thought